Given that abundant evidence, it is inappropriate for many anti-smoking advocates and groups to continue to tell the public that we don't yet know whether vaping is safer than smoking.

The study finds that e-cigarette use is associated with smoking status. In addition, e-cigarette use is associated with heavier smoking and with fewer periods of smoking abstinence.

In other words, what these members of Congress are asking the nation's law enforcement chiefs to do is to violate their own state laws.

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